Facebook, WhatsApp, Messenger, and Instagram have been down since the morning of Oct. 4, the firm confirmed. When attempting to access Facebook, it returned a message: “This site can’t be reached,” adding that the website’s DNS address couldn’t be found. Instagram merely displayed the message: “5xx Server Error.” Downdetector.com shows that as of 11:46 a.m. New York time, more than 80,000 reports had been made complaining of a Facebook outage. Similar complaints were posted about WhatsApp and Instagram, which are both operated by Facebook. “We’re aware that some people are having trouble accessing our apps and products,” Facebook wrote on Twitter at around 12:30 p.m. New York time. “We’re working to get things back to normal as quickly as possible, and we apologize for any inconvenience.” Hours later, at around 3 p.m., the company’s outgoing chief technology officer, Mike Schroepfer, wrote that the firm is still working to fix the issue. …